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Spurious shown when DDC gain is 6dB

Question asked by JohnDean on Apr 8, 2018
Latest reply on Apr 10, 2018 by UmeshJ

Hi,

 

I've purchased the AD9208-3000EBZ ADC and the ADS7-V2 evaluation board.

 

I noticed that when I enable the DDCs and gives a DDC gain the 6dB boost the all FFT just gets filled with spuriouses  without any connection to the original Fund. Those spuriouses are at least above 30dB of the noise level. When the DDC gain is 0dB they don't appear (there are just the normal Harms).

 

Do you know any solution to this problem?

 

Sincerely Yours,

John.

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